The paper length is not relevant since the chart flows from one page to the next.
Mobile
in.
mm
Portrait
2.75
70
For smart phones, not for printing
Landscape
5.5
140
For smart phones, not for printing
USA & Canada
in.
mm
Letter Portrait
8.5
216
Also Legal Portrait
Letter Landscape
11
279
Legal Landscape
14
356
Also Ledger Portrait
Ledger Landscape
17
432
International
in.
mm
A5 Portrait
5.82
148
A4 Portrait
8.25
210
Also A5 Landscape
A4 Landscape
11.71
297
Also A3 Landscape
A3 Landscape
16.54
420
The Text+ programs assume that the right and left margins are each about 25mm (1/2 inch) wide.
On the Format for Printing page, differences in page margins can be accommodated by the "fudge factor":
Father: Albert Bos
(Cal 1835 Muntendam, Groningen, Nederland - Yes, date unknown)
Trientje Bos
(1869 Wedde, Groningen, Nederland - 29 Dec 1942 Finsterwolde, Groningen, Nederland)
Jan Leeuwerke
(Cal 1875 Nieuweschans, Groningen, Nederland - Yes, date unknown)
         ├─ Berend Leeuwerke
(22 Jan 1898 Finsterwolde, Groningen, Nederland - Yes, date unknown)
         │ Beka Boneschansker
(29 Oct 1900 Bellingwolde, Groningen, Nederland - 13 Feb 1945 Bellingwolde, Groningen, Nederland)
         │          └─ Trijntje Aaltje Leeuwerke
(Yes, date unknown - Yes, date unknown)
         │           + Jan Edo de Boer
(20 May 1930 - 24 Oct 2001 Muntendam, Groningen, Nederland)
         └─ Trijntje Juliana Leeuwerke
(24 Sep 1900 Finsterwolde, Groningen, Nederland - Yes, date unknown)
          + Eltjo Jan Oosterhuis
(Cal 1892 Meeden, Groningen, Nederland - Yes, date unknown)